Vista Sync Toy.

Since I use a USB drive for data backup, one of my favorite XP programs is SyncToy from Microsoft. Now that I am using Vista I missed this tool, so I was very happy to find SyncToy 1.4 which works with Vista!

http://www.microsoft.com/downloads/details.aspx?familyid=E0FC1154-C975-4814-9649-CCE41AF06EB7&displaylang=en